No Audio Output in Vista, Part 2
Seems like lots of people looking to fix audio problems are finding there way here for answers and not all are finding the solution to their specific problems. While helping everyone may be too big a goal, I offer this "Part 2" on troubleshooting audio devices in Vista in an effort to be "more helpful". [Part 1 is here]
Uninstall any audio management software (such as Sigma Tel Audio) and then obtain the latest from your computer manufacturer website. Often video and audio drivers can come with management software that normally helps, but with Vista could be another place for Vista incompatibility. Generally, ensuring you remove your existing management software and driver, reboot, and then install the very latest is a reliable measure to getting back in business.
If you are working with a computer from a major manufacturer like Dell, HP or IBM hit their sites for drivers/management software. If that does not work, you can move on to obtaining the latest for your specific hardware at the audio card manufacturer's site but unless you open the computer up and look in the right place it can be difficult to ascertain just what you have in there.
Naturally if you installed the audio card yourself either because you built the computer up yourself or upgraded the card, you'll need to hit the manufacturer's site directly for the required driver. The manual, box or bag you got with the card should give you the information you need to select the correct driver. Also sites often provide pictures or drawings to help you identify your card and determine the correct driver. One additional issue with self-installed audio cards is that the front audio jack will often not work unless you specifically wire it. So if the rear jack works but not those on the front of the computer, look to the manual (if you don't have it most manuals can be found online) for what wires need to be connected for this to function properly.

Digg it!
Del.icio.us
Reddit!
Newsvine